PERIODIC MAINTENANCE
114
JH Series Operation Manual
Note: These procedures are considered normal maintenance and are performed at the
owner’s expense.
Cooling
System
Seawater outlet
During
Operation
Check coolant level
Check or replace the
seawater pump impeller
Replace coolant
Every year. When Long Life Coolant is used, replace every 2 years.
See Engine Coolant Specifications on page 55
.
Clean and check the
seawater passages
●
Air Intake
and
Exhaust
System
Clean intake silencer (air
cleaner) element
Clean or replace the
exhaust/water mixing elbow
Wash the turbocharger
blower - 4JH80/4JH110 only
●
Check diaphragm assembly
3JH40/4JH45/4JH57 only
●
Electrical
System
Check the alarm and
indicators
Check the electrolyte level in
the battery
Adjust the tension of the
alternator V-ribbed belt or
replace V-ribbed belt
Initial 50
Check the wiring connectors
Engine
Cylinder
Head and
Block
Check for leakage of fuel,
engine oil and engine coolant
After
starting
Tighten all major nuts and bolts
●
Adjust intake/exhaust valve
clearance
●
Initial 50
●
Miscellane
ous Items
Check the remote control
cable operation
Initial 50
●
Adjust the propeller shaft
alignment
●
Initial 50
●
Replace rubberized hoses
(fuel and water)
Replace every 2 years.
: Check or Clean
: Replace
●
: Consult your authorized YANMAR Marine dealer or distributor
System Item
Periodic Maintenance Interval
Daily
See Daily
Checks
on
page 116
Every 50
hours or
monthly
which-
ever
comes
first
Every 250
hours or
1 year
which-
ever
comes
first
Every 500
hours or
2 years
which-
ever
comes
first
Every
1000
hours or
4 years
which-
ever
comes
first
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